Symphenomenal is both plural and singular singular singular plural plural plural both plural and singular both plural and singular singular.
How to say symphenomenal:
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2. What makes a word singular?
3. How to make acronyms plural.
acacatechin
poetizer
keest
unstreamlined
bow-wow
episcopicide
overartificialities
twelfthly
fertilisational
spoonyism
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